pjsip_scheduler.c File Reference

res_pjsip Scheduler More...

#include "asterisk.h"
#include "asterisk/res_pjsip.h"
#include "include/res_pjsip_private.h"
#include "asterisk/res_pjsip_cli.h"
#include "asterisk/taskprocessor.h"
#include <regex.h>

Include dependency graph for pjsip_scheduler.c:

Go to the source code of this file.

Data Structures
struct	ast_sip_sched_task

Macros
#define	ID_LEN   13 /* task_deadbeef */
#define	TASK_BUCKETS   53
#define	TIME_FORMAT   "%a %T"

Functions
	AO2_STRING_FIELD_CMP_FN (ast_sip_sched_task, name)
	AO2_STRING_FIELD_HASH_FN (ast_sip_sched_task, name)
	AO2_STRING_FIELD_SORT_FN (ast_sip_sched_task, name)
int	ast_sip_destroy_scheduler (void)
int	ast_sip_initialize_scheduler (void)
	Initialize scheduler. More...
int	ast_sip_sched_is_task_running (struct ast_sip_sched_task *schtd)
	Checks if the task is currently running. More...
int	ast_sip_sched_is_task_running_by_name (const char *name)
	Checks if the task is currently running. More...
int	ast_sip_sched_task_cancel (struct ast_sip_sched_task *schtd)
	Cancels the next invocation of a task. More...
int	ast_sip_sched_task_cancel_by_name (const char *name)
	Cancels the next invocation of a task by name. More...
int	ast_sip_sched_task_get_name (struct ast_sip_sched_task *schtd, char *name, size_t maxlen)
	Gets the task name. More...
int	ast_sip_sched_task_get_next_run (struct ast_sip_sched_task *schtd)
	Gets the number of milliseconds until the next invocation. More...
int	ast_sip_sched_task_get_next_run_by_name (const char *name)
	Gets the number of milliseconds until the next invocation. More...
int	ast_sip_sched_task_get_times (struct ast_sip_sched_task *schtd, struct timeval *queued, struct timeval *last_start, struct timeval *last_end)
	Gets the last start and end times of the task. More...
int	ast_sip_sched_task_get_times2 (struct ast_sip_sched_task *schtd, struct timeval *queued, struct timeval *last_start, struct timeval *last_end, int *interval, int *time_left, struct timeval *next_start)
	Gets the queued, last start, last_end, time left, interval, next run. More...
int	ast_sip_sched_task_get_times_by_name (const char *name, struct timeval *queued, struct timeval *last_start, struct timeval *last_end)
	Gets the last start and end times of the task by name. More...
int	ast_sip_sched_task_get_times_by_name2 (const char *name, struct timeval *queued, struct timeval *last_start, struct timeval *last_end, int *interval, int *time_left, struct timeval *next_start)
	Gets the queued, last start, last_end, time left, interval, next run by task name. More...
struct ast_sip_sched_task *	ast_sip_schedule_task (struct ast_taskprocessor *serializer, int interval, ast_sip_task sip_task, const char *name, void *task_data, enum ast_sip_scheduler_task_flags flags)
	Schedule a task to run in the res_pjsip thread pool. More...
static char *	cli_show_tasks (struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
static int	push_to_serializer (const void *data)
static int	run_task (void *data)
static void	schtd_dtor (void *data)

Variables
static struct ast_cli_entry	cli_commands []
static struct ast_sched_context *	scheduler_context
static int	task_count
static struct ao2_container *	tasks

Detailed Description

res_pjsip Scheduler

Author

George Joseph georg.nosp@m.e.jo.nosp@m.seph@.nosp@m.fair.nosp@m.view5.nosp@m..com

Definition in file pjsip_scheduler.c.

Macro Definition Documentation

ID_LEN

#define ID_LEN   13 /* task_deadbeef */

Referenced by ast_sip_schedule_task().

TASK_BUCKETS

#define TASK_BUCKETS   53

Definition at line 35 of file pjsip_scheduler.c.

Referenced by ast_sip_initialize_scheduler().

TIME_FORMAT

#define TIME_FORMAT   "%a %T"

Definition at line 488 of file pjsip_scheduler.c.

Referenced by cli_show_tasks().

Function Documentation

AO2_STRING_FIELD_CMP_FN()

AO2_STRING_FIELD_CMP_FN	(	ast_sip_sched_task	,
		name
	)

AO2_STRING_FIELD_HASH_FN()

AO2_STRING_FIELD_HASH_FN	(	ast_sip_sched_task	,
		name
	)

AO2_STRING_FIELD_SORT_FN()

AO2_STRING_FIELD_SORT_FN	(	ast_sip_sched_task	,
		name
	)

ast_sip_destroy_scheduler()

int ast_sip_destroy_scheduler

(

void

)

Definition at line 642 of file pjsip_scheduler.c.

References ao2_cleanup, ao2_iterator_destroy(), ao2_iterator_init(), ao2_iterator_next, ao2_ref, ARRAY_LEN, ast_cli_unregister_multiple(), ast_sched_context_destroy(), ast_sip_sched_task_cancel(), and NULL.

Referenced by load_module(), and unload_module().

{
   ast_cli_unregister_multiple(cli_commands, ARRAY_LEN(cli_commands));

   if (scheduler_context) {
      if (tasks) {
         struct ao2_iterator iter;
         struct ast_sip_sched_task *schtd;

         /* Cancel all scheduled tasks */
         iter = ao2_iterator_init(tasks, 0);
         while ((schtd = ao2_iterator_next(&iter))) {
            ast_sip_sched_task_cancel(schtd);
            ao2_ref(schtd, -1);
         }
         ao2_iterator_destroy(&iter);
      }

      ast_sched_context_destroy(scheduler_context);
      scheduler_context = NULL;
   }

   ao2_cleanup(tasks);
   tasks = NULL;

   return 0;
}

ast_sip_initialize_scheduler()

int ast_sip_initialize_scheduler

(

void

)

Initialize scheduler.

Since

13.9.0

Return values

-1	failure
0	success

Definition at line 614 of file pjsip_scheduler.c.

References AO2_ALLOC_OPT_LOCK_RWLOCK, ao2_container_alloc_hash, AO2_CONTAINER_ALLOC_OPT_DUPS_REJECT, ARRAY_LEN, ast_cli_register_multiple, ast_log, ast_sched_context_create(), ast_sched_context_destroy(), ast_sched_start_thread(), LOG_ERROR, and TASK_BUCKETS.

Referenced by load_module().

{
   scheduler_context = ast_sched_context_create();
   if (!scheduler_context) {
      ast_log(LOG_ERROR, "Failed to create scheduler. Aborting load\n");
      return -1;
   }

   if (ast_sched_start_thread(scheduler_context)) {
      ast_log(LOG_ERROR, "Failed to start scheduler. Aborting load\n");
      ast_sched_context_destroy(scheduler_context);
      return -1;
   }

   tasks = ao2_container_alloc_hash(AO2_ALLOC_OPT_LOCK_RWLOCK,
      AO2_CONTAINER_ALLOC_OPT_DUPS_REJECT, TASK_BUCKETS, ast_sip_sched_task_hash_fn,
      ast_sip_sched_task_sort_fn, ast_sip_sched_task_cmp_fn);
   if (!tasks) {
      ast_log(LOG_ERROR, "Failed to allocate task container. Aborting load\n");
      ast_sched_context_destroy(scheduler_context);
      return -1;
   }

   ast_cli_register_multiple(cli_commands, ARRAY_LEN(cli_commands));

   return 0;
}

cli_show_tasks()

static char* cli_show_tasks ( struct ast_cli_entry *  e, int  cmd, struct ast_cli_args *  a  )

static

Definition at line 490 of file pjsip_scheduler.c.

References AO2_ALLOC_OPT_LOCK_NOLOCK, ao2_container_alloc_rbtree, ao2_container_count(), ao2_container_dup(), ao2_iterator_destroy(), ao2_iterator_init(), ao2_iterator_next, AO2_ITERATOR_UNLINK, ao2_lock, ao2_ref, ao2_unlock, ast_cli_args::argc, ast_cli_args::argv, ast_cli(), ast_localtime(), ast_sip_sched_task_get_next_run(), AST_SIP_SCHED_TASK_ONESHOT, ast_strftime(), ast_tv(), ast_tvadd(), ast_tvnow(), ast_tvzero(), CLI_FAILURE, CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, ast_cli_args::fd, ast_sip_sched_task::flags, ast_sip_sched_task::interval, ast_sip_sched_task::is_running, ast_sip_sched_task::last_start, ast_sip_sched_task::name, NULL, regex(), ast_sip_sched_task::run_count, TIME_FORMAT, ast_cli_entry::usage, and ast_sip_sched_task::when_queued.

{
   struct ao2_iterator iter;
   struct ao2_container *sorted_tasks;
   struct ast_sip_sched_task *schtd;
   struct ast_tm tm;
   char times_run[16];
   char queued[32];
   char last_start[32];
   char next_start[32];
   struct timeval now;
   int using_regex = 0;
   regex_t regex;

   switch (cmd) {
   case CLI_INIT:
      e->command = "pjsip show scheduled_tasks";
      e->usage = "Usage: pjsip show scheduled_tasks [ like <pattern> ]\n"
                  "      Show scheduled pjsip tasks\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if (a->argc != 3 && a->argc != 5) {
      return CLI_SHOWUSAGE;
   }

   if (a->argc == 5) {
      int regrc;
      if (strcasecmp(a->argv[3], "like")) {
         return CLI_SHOWUSAGE;
      }
      regrc = regcomp(&regex, a->argv[4], REG_EXTENDED | REG_ICASE | REG_NOSUB);
      if (regrc) {
         char err[256];
         regerror(regrc, &regex, err, 256);
         ast_cli(a->fd, "PJSIP Scheduled Tasks: Error: %s\n", err);
         return CLI_FAILURE;
      }
      using_regex = 1;
   }

   /* Get a sorted snapshot of the scheduled tasks */
   sorted_tasks = ao2_container_alloc_rbtree(AO2_ALLOC_OPT_LOCK_NOLOCK, 0,
      ast_sip_sched_task_sort_fn, NULL);
   if (!sorted_tasks) {
      ast_cli(a->fd, "PJSIP Scheduled Tasks: Unable to allocate temporary container\n");
      return CLI_FAILURE;
   }
   if (ao2_container_dup(sorted_tasks, tasks, 0)) {
      ao2_ref(sorted_tasks, -1);
      ast_cli(a->fd, "PJSIP Scheduled Tasks: Unable to sort temporary container\n");
      return CLI_FAILURE;
   }

   now = ast_tvnow();

   ast_localtime(&now, &tm, NULL);

   ast_cli(a->fd, "PJSIP Scheduled Tasks:\n\n");

   ast_cli(a->fd,
      "<Task Name....................................> <Interval> <Times Run> <State>"
      "  <Queued....>  <Last Start>  <Next Start.....secs>\n"
      "=============================================================================="
      "===================================================\n");

   iter = ao2_iterator_init(sorted_tasks, AO2_ITERATOR_UNLINK);
   for (; (schtd = ao2_iterator_next(&iter)); ao2_ref(schtd, -1)) {
      int next_run_sec;
      struct timeval next;

      ao2_lock(schtd);

      if (using_regex && regexec(&regex, schtd->name, 0, NULL, 0) == REG_NOMATCH) {
         ao2_unlock(schtd);
         continue;
      }

      next_run_sec = ast_sip_sched_task_get_next_run(schtd) / 1000;
      if (next_run_sec < 0) {
         /* Scheduled task is now canceled */
         ao2_unlock(schtd);
         continue;
      }
      next = ast_tvadd(now, ast_tv(next_run_sec, 0));

      ast_localtime(&schtd->when_queued, &tm, NULL);
      ast_strftime(queued, sizeof(queued), TIME_FORMAT, &tm);

      ast_localtime(&schtd->last_start, &tm, NULL);
      ast_strftime(last_start, sizeof(last_start), TIME_FORMAT, &tm);

      ast_localtime(&next, &tm, NULL);
      ast_strftime(next_start, sizeof(next_start), TIME_FORMAT, &tm);

      sprintf(times_run, "%d", schtd->run_count);

      ast_cli(a->fd, "%-46.46s   %9d   %9s   %-5s  %-12s  %-12s  %-12s %8d\n",
         schtd->name,
         schtd->interval / 1000,
         schtd->flags & AST_SIP_SCHED_TASK_ONESHOT ? "oneshot" : times_run,
         schtd->is_running ? "run" : "wait",
         queued,
         (ast_tvzero(schtd->last_start) || (schtd->flags & AST_SIP_SCHED_TASK_ONESHOT) ? "" : last_start),
         next_start,
         next_run_sec);
      ao2_unlock(schtd);
   }
   if (using_regex) {
      regfree(&regex);
   }
   ao2_iterator_destroy(&iter);
   ast_cli(a->fd, "\nTotal Scheduled Tasks: %d\n\n", ao2_container_count(sorted_tasks));
   ao2_ref(sorted_tasks, -1);

   return CLI_SUCCESS;
}

push_to_serializer()

static int push_to_serializer ( const void *  data )

static

Definition at line 157 of file pjsip_scheduler.c.

References ao2_lock, ao2_t_ref, ao2_unlink, ao2_unlock, ast_log, ast_sip_push_task(), AST_SIP_SCHED_TASK_TRACK, ast_sip_sched_task::current_scheduler_id, ast_sip_sched_task::flags, ast_sip_sched_task::interval, LOG_DEBUG, ast_sip_sched_task::name, run_task(), and ast_sip_sched_task::serializer.

Referenced by ast_sip_schedule_task(), and run_task().

{
   struct ast_sip_sched_task *schtd = (struct ast_sip_sched_task *)data;
   int sched_id;

   ao2_lock(schtd);
   sched_id = schtd->current_scheduler_id;
   schtd->current_scheduler_id = -1;
   ao2_unlock(schtd);
   if (sched_id < 0) {
      /* Task was cancelled while waiting on the lock */
      return 0;
   }

   if (schtd->flags & AST_SIP_SCHED_TASK_TRACK) {
      ast_log(LOG_DEBUG, "Sched %p: Ready to run %s\n", schtd, schtd->name);
   }
   ao2_t_ref(schtd, +1, "Give ref to run_task()");
   if (ast_sip_push_task(schtd->serializer, run_task, schtd)) {
      /*
       * Oh my.  Have to cancel the scheduled item because we
       * unexpectedly cannot run it anymore.
       */
      ao2_unlink(tasks, schtd);
      ao2_lock(schtd);
      schtd->interval = 0;
      ao2_unlock(schtd);

      ao2_t_ref(schtd, -1, "Failed so release run_task() ref");
   }

   return 0;
}

run_task()

static int run_task ( void *  data )

static

Definition at line 80 of file pjsip_scheduler.c.

References ao2_cleanup, ao2_lock, ao2_unlink, ao2_unlock, ast_log, ast_samp2tv(), ast_sched_add(), AST_SIP_SCHED_TASK_DELAY, AST_SIP_SCHED_TASK_ONESHOT, AST_SIP_SCHED_TASK_TRACK, AST_SIP_SCHED_TASK_VARIABLE, ast_tvadd(), ast_tvdiff_ms(), ast_tvnow(), ast_sip_sched_task::interval, LOG_DEBUG, LOG_ERROR, push_to_serializer(), and RAII_VAR.

Referenced by push_to_serializer().

{
   RAII_VAR(struct ast_sip_sched_task *, schtd, data, ao2_cleanup);
   int res;
   int delay;

   if (!schtd->interval) {
      /* Task was cancelled while waiting to be executed by the serializer */
      return -1;
   }

   if (schtd->flags & AST_SIP_SCHED_TASK_TRACK) {
      ast_log(LOG_DEBUG, "Sched %p: Running %s\n", schtd, schtd->name);
   }
   ao2_lock(schtd);
   schtd->last_start = ast_tvnow();
   schtd->is_running = 1;
   ++schtd->run_count;
   ao2_unlock(schtd);

   res = schtd->task(schtd->task_data);

   ao2_lock(schtd);
   schtd->is_running = 0;
   schtd->last_end = ast_tvnow();

   /*
    * Don't restart if the task returned <= 0 or if the interval
    * was set to 0 while the task was running
    */
   if ((schtd->flags & AST_SIP_SCHED_TASK_ONESHOT) || res <= 0 || !schtd->interval) {
      schtd->interval = 0;
      ao2_unlock(schtd);
      ao2_unlink(tasks, schtd);
      return -1;
   }

   if (schtd->flags & AST_SIP_SCHED_TASK_VARIABLE) {
      schtd->interval = res;
   }

   if (schtd->flags & AST_SIP_SCHED_TASK_DELAY) {
      delay = schtd->interval;
   } else {
      int64_t diff;

      /* Determine next periodic interval we need to expire. */
      do {
         schtd->next_periodic = ast_tvadd(schtd->next_periodic,
            ast_samp2tv(schtd->interval, 1000));
         diff = ast_tvdiff_ms(schtd->next_periodic, schtd->last_end);
      } while (diff <= 0);
      delay = diff;
   }

   schtd->current_scheduler_id = ast_sched_add(scheduler_context, delay, push_to_serializer, schtd);
   if (schtd->current_scheduler_id < 0) {
      schtd->interval = 0;
      ao2_unlock(schtd);
      ast_log(LOG_ERROR, "Sched %p: Failed to reschedule task %s\n", schtd, schtd->name);
      ao2_unlink(tasks, schtd);
      return -1;
   }

   ao2_unlock(schtd);
   if (schtd->flags & AST_SIP_SCHED_TASK_TRACK) {
      ast_log(LOG_DEBUG, "Sched %p: Rescheduled %s for %d ms\n", schtd, schtd->name,
         delay);
   }

   return 0;
}

schtd_dtor()

static void schtd_dtor ( void *  data )

static

Definition at line 399 of file pjsip_scheduler.c.

References ao2_ref, ast_free, ast_log, AST_SIP_SCHED_TASK_DATA_AO2, AST_SIP_SCHED_TASK_DATA_FREE, AST_SIP_SCHED_TASK_TRACK, ast_taskprocessor_unreference(), ast_sip_sched_task::flags, LOG_DEBUG, ast_sip_sched_task::name, ast_sip_sched_task::serializer, and ast_sip_sched_task::task_data.

Referenced by ast_sip_schedule_task().

{
   struct ast_sip_sched_task *schtd = data;

   if (schtd->flags & AST_SIP_SCHED_TASK_TRACK) {
      ast_log(LOG_DEBUG, "Sched %p: Destructor %s\n", schtd, schtd->name);
   }
   if (schtd->flags & AST_SIP_SCHED_TASK_DATA_AO2) {
      /* release our own ref, then release the callers if asked to do so */
      ao2_ref(schtd->task_data, (schtd->flags & AST_SIP_SCHED_TASK_DATA_FREE) ? -2 : -1);
   } else if (schtd->task_data && (schtd->flags & AST_SIP_SCHED_TASK_DATA_FREE)) {
      ast_free(schtd->task_data);
   }
   ast_taskprocessor_unreference(schtd->serializer);
}

Variable Documentation

cli_commands

struct ast_cli_entry cli_commands[]

static

Initial value:

= {
   { .handler =  cli_show_tasks , .summary =  "Show pjsip scheduled tasks" ,},
}

Definition at line 610 of file pjsip_scheduler.c.

scheduler_context

struct ast_sched_context* scheduler_context

static

Definition at line 37 of file pjsip_scheduler.c.

task_count

int task_count

static

Definition at line 39 of file pjsip_scheduler.c.

Referenced by ast_sip_schedule_task().

tasks

struct ao2_container* tasks

static

Definition at line 38 of file pjsip_scheduler.c.